Shuttering system for cast concrete walls



Ju 1961 F. BITTNER 2,989,794

SHUTTERING SYSTEM FOR CAST CONCRETE WALLS Filed June 20, 1956 2Sheets-Sheet 1 ,1-75 FIG. 2 F/6.- 3

IL L 1 INVEN TOR.

flea/V2 5/77/1/51? June 27, 1961 F. BITTNER SHUTTERING SYSTEM FOR CASTCONCRETE WALLS Filed June 20, 1956 2 Sheets-Sheet 2 1 :iiii:

United States Patent 2,989,794 SHUTTERING SYSTEM FOR CAST CONCRETE WALLSFranz Bittner, Salzburg, Austria Filed June 20, 1956, Ser. No. 592,579Claims. (Cl. 25-131) The present invention relates to the constructionof concrete walls of all types.

It is the principal object of this invention to provide an improved,simple, highly economical shuttering system for the building of alltypes of multi-story concrete walls.

Recently, a very simple and advantageous concrete shuttering assemblyhas been developed, wherein the shuttering supports lie within the coreof the wall and may be recovered therefrom.

In accordance with the invention, this type of concrete shuttering hasbeen so improved that it may be used not only for small buildings butalso in the construction of skyscrapers.

According to an essential feature of the invention, the shutteringsupports overlap in the plane of the building ceilings so that the outershuttering support of the next higher floor may be supported by theinner shuttering support of the next lower floor during a predeterminedportion of the concrete hardening period. This improves the rigidity andthe accuracy to size of the concrete shuttering.

The various objects, features and advantages of the invention will bemore fully understood in connection with the following detaileddescription of certain pre ferred embodiments thereof, taken inconjunction with the drawing wherein FIG. 1 shows a vertical section ofa multi-story wall erected with the aid of the shuttering supportsaccording to the present invention;

FIG. 2 is a perspective view of a spacer;

FIG. 3 is a perspective view of a wire loop for mounting the shutteringpanels on the supports;

FIG. 4'is a vertical section showing a portion of the is assembled bymounting spacers 5 in horizontally aligned apertures in rods 1 and 2'.As shown, lowermost aperture 3' in the outer rod may be an elongatedslot to permit adjustment of the positioning of the rod. The ladder-likesupport 1, 2, 5' is now ready for mount! ing of the shuttering (asillustrated in FIGS. 4-7). After the second story wall is cast, theprocedure is repeated by removing outer support rod 1' and anchoringnext higher support rod 1" to the completed lower wall section.

When, after removal of the inner shuttering and dismantling of the innervertical rod, all the spacers, except the two uppermost ones, are takenout of the wall. The latter spacers must temporarily remain in the wallto retain the outer rod 1, being held in place by wedging on the innerwall surface, for instance. This may be accomplished by means of a rodpiece of the same profile as the inner rod or by means of a wedge whichis placed into the aperture of the spacer and contacts the wall.

FIG. 2 shows a preferred embodiment of a spacer. As shown in thedrawing, spacer 5 has a transversely tapering center portion of arcuatecross section with two lugs 6 having slots 7.

FIG. 3 shows a shuttering panel retaining wire loop member 29 bent toform an inner portion 27 adapted to engage a support rod 1 or 2 (seeFIGS. 4 and 5) and two parallel lateral portions 26. The outer ends ofthe lateral wire portions are twisted to form triangular elements 33 and35. A transverse connecting element constituted by steel plate 31 withreinforcing crimp 34 is hinged to triangular element 35 at 36. The otherend of the steel connecting element has a bent-over latch 32 shuttering,including the panels mounted on the form I support by means of a wireloop wedge connection;

'FIG. 5 is a section along line VV of FIG. 4;

, .FIG. 6 is aside view, partly in section, of the base hook provided atthe bottom of the support for mounting the shuttering panels;

FIG..7 is a section alongline VII--VII of FIG. 6; and

FIG. 8 schematically shows the erection of a threestory concrete wallwith the aid of the shuttering assembly of the present invention. i

Referring now more particularly to the drawing, FIG. lgillustrates howthe shutten'ngsupports leapfrog from fioor to floor. As shown, the outersupport rod 1 of the shuttering support extends beyond the height of thefirst story while the inner support has the same length as the height ofthe story. The support rods have a plurality of superposed horizontallyaligned apertures 3, 4 and each pair of rods is assembled with spacerslike a ladder. After the concrete wall A and the ceiling B have beencast and have set, the outer form panels of the lowest floor aredismantled, the outer rod 1 is removed from the wall and, as shown at 1,is mounted with its lowermost aperture 3 in alignment with the uppermostspacer remaining temporarily in wall A to form the outer support rod forthe shuttering in the next highest floor. If desired, the base hook 8may be connected with the next adjacent spacer, in which case the samealso temporarily remains in the wall. After the outer support rod hasbeen anchored to the uppermost spacer or spacers in wall A, the twouppermost spacers being more closely spaced than the remaining spacers,as shown, the inner support rod 2 for the next higher story is erectedand the shuttering support adapted to engage the opposite triangularelement 33-.

FIGS. 4 and 5 show the complete shuttering assembly including verticalsupport rods 1 and 2 connected by spacers 5. The spacers are shownrigidly but removably mounted with their lugs 6 in horizontally alignedapertures 3, 4 of the vertical rods, iron wedges 34 being forced intolug slots 7 to hold the structure in place. As more clearly shown inFIG. 5, the vertical rods are channel-shaped and spacer lugs 6 extendinto the longitudinal recesses in the channel-shaped support rods whichare temporarily embedded in wall A.

The wall shuttering is constituted by adjacently mounted panels 11between which the concrete is cast. Each panel has longitudinallyextending frames 9 and transverse ribs 10. Loop wire members 29 aremounted between adjacent panels (see FIG. 4) with their inner portion 27engaging the support rods and their lateral portions 26 extendingoutwardly of panels 11. The latch 32 is then connected to element 33 toclose the loop and a wedge 37 is forced between the closed loops and theframes 9 of adjacent panels to secure the panels to the outsides of thesupport rods and to hold the shuttering securely against outwarddisplacement.

As shown in FIGS. .6 and 7, the lowermost panels are secured to thesupport rods by means of a base hook 8. The ends of the support rodshave a cross plate 40 extending across their recesses, plates 40 beingwelded to the rods. Base hooks 8 have a vertically extending leg 12which is adapted to engage plate 40 and thus to hold the base hook onthe rod. A wedge 42 is forced between the frame 9 and the outer end ofthe hook to hold the panels 8 in position.

FIG. 8 schematically illustrates the leap-frog method of erecting amulti-story concrete wall with the shuttering of the present invention.Reading from left to right, phase 1 shows the shuttering erected forfloor 1, the outer shuttering A including a vertical support rodanchored to the building base and extending into the next story whilethe inner shuttering J has the same length as the height of floor I. Theconcrete shuttering panels Ice Patented June 27, 1961,

3 are shown mounted on the outside of the support rods, as illustratedin detail in FIGS. 4 and 5.

Phase 2 shows the wall section of the first floor cast in the shutteringand the ceiling between the first and second floors finished. After thewalling and ceiling of the first floor is thus completed, outershuttering A is shown in phase 3 to be removed from fioor I and liftedto floor II, its lower end being anchored to the uppermost spacerremaining in the wall of floor I. An inner shuttering J is now put inplace to complete the shuttering assembly for the second story. Thesecond story wall and ceiling are now poured, as shown in phase 4, theinner shuttering I is removed from floor I and, as shown in phase 5,erected on floor III, shuttering A having been dismantled from thesecond story wall and erected thereabove in the manner shown andpreviously described in connection with the lower story. Phase 6 showsthe concrete poured for floor III.

While the invention has been described by way of example in connectionwith certain now preferred embodiments thereof, it will be clearlyunderstood that many variations and modifications may occur to theskilled in the art without departing from the spirit and scope of theinvention as defined in the appended claims.

What is claimed is:

1. A shuttering assembly for the construction of a concrete multi-storybuilding wall, comprising a first concrete wall section of one storyheight, said wall section having an inside face, an outside face and anupper end, at least one row of transverse spacers having slotted endsmounted in said wall section near its upper end, said transverse spacersextending with one slotted end beyond the outside wall face, slidablyremovable wedge means for anchoring the other slotted end of the spacersto the inside wall face, a plurality of pairs of aligned verticalsupports arranged atop said wall section, each of said pairs consistingof an inner support extending substantially the height of the next storyand an outer support extending down to a respective one of saidtransverse spacers, slidably removable wedges for securing the extendingslotted ends of the transverse spacers to the outer supports, saidsupports having a plurality of superposed apertures, the apertures ofeach pair of supports being horizontally aligned, a plurality ofsuperposed transverse spacers having slotted ends mounted inhorizontally aligned ones of said apertures in each pair of verticalsupports, slidably removable wedges in said slotted ends of thelast-named spacers for securing the last-named spacers to respectiveones of said vertical supports, a plurality of adjacently positionedpanels mounted on the outsides of and supported solely by the verticalsupports to form a vertical shuttering internally supported by thesupports, and removable wedge means for securing the panels to thesupports against outward displacement.

2. The shuttering assembly of claim 1, wherein said removable means forsecuring the panels to the supports comprises a plurality of loopmembers each having an inner portion engaging the supports, twosubstantially parallel lateral portions integral with and extendingoutwardly from said inner portion and a transverse connecting elementpermanently attached to the outer end of one of the lateral portions andremovably secured to the outer end of the other one of the lateralportions to form a closed loop, each loop member being mounted with itslateral portions vertically adjacent one of said panels, the transverseconnecting elements of the loop members being outwardly spaced from thepanels, and wedge elements slidably secured between the panels and thetransverse connecting elements.

3. The shuttering assembly of claim 1, further comprising a base hookhaving an inner end removably attached to the lower end of each one ofsaid supports and a hooked end extending outwardly of said supports andbeyond said panels, and a wedge element slidably secured between thepanels and said hooked ends.

4. The shuttering assembly of claim 1, wherein the apertures near thelower ends of said outer support rods are vertically extending slots forvertically adjustable attachment to the transverse spacers in said firstwall section.

5. The shuttering assembly of claim 1, wherein the spacing between thetwo uppermost spacers is smaller than the spacing between the otherspacers.

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